Automatic fast rewinder for shaftless packing film

ABSTRACT

An automatic fast rewinder for shaftless packing film includes a body, a feeding box for containing inflated shafts, a guide passage formed in the feeding box, a pair of rotary discs, four pairs of pinching heads, a support frame for holding a large roll of packing film, plural guide wheels and a pressing wheel for pressing and move packing film of the large roll, a saw-teeth cutting unit, and a collect unit and plural inflatable shafts. In operation, the four pairs of pinching pins rotating with the rotary discs are moved orderly to pinch or release the inflatable shaft to rewound with packing film of the large roll, cut by the cutting unit, then dropped down on the collect unit. So the finished small rolls with the inflated shafts have inflated shaft deflated and pulled out so the finished small roll becomes a small roll without a winding shaft.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to an automatic fast rewinder for shaftlesspacking film, particularly to one rewinding a large packing film rollinto plural small packing film rolls without a winding shaft, shorteningtime needed for rewinding, stepping up production and saving cost withenvironmental friendly effects.

2. Description of the Prior Art

Packing films are generally made by rewinding a large packing film rollinto plural small packing film rolls by means of a rewinder tofacilitate using packing film. A conventional rewinder for this purposeshown in FIGS. 1 and 2 includes a body 10, a support frame 11 fixed onthe body 1 for holding a large packing film roll (a) thereon, pluralguide wheels 12 and a pressing wheel 13 installed on the body 1 formoving the packing film of the large roll. Then the packing film (a) ofthe large roll is pulled by rotation of the guide wheel pressed down bythe pressing wheel 13 located at the last guide wheel 12. The rewinderis further provided with a feeding unit 14 and a pinching unit 15installed on the body 1 and a hot line cutting unit 16 installed on thebody 1, and a receptive box 17 placed at one side of the body 1 forstoring plural tubular winding shafts (b) made of paper or plastic.

In using, the tubular winding shaft (b) is pushed one by one by thefeeding unit 14 to the pinching unit 15, which then pinches the windingshaft (b) tightly, with the packing film (a) pulled by the guide wheels12 to the winding shaft (b). Then the winding shaft (b) is rotated,winding the packing film (a) continually until the winding shaft (a)with the wound packing film has a needed diameter, and then the pinchingunit 15 carries the winding shaft (b) upward and leftward to the hotline cutting unit 16, which then cuts off the packing film (a) off thelarge roll, finishing rewinding the large packing film roll into onesmall film roll with one round of operation.

The conventional rewinder can rewind the packing film (a) into only onesmall film roll by one round of operation, so its production is slow,not effective. Moreover, the winding shaft (b) has to be discarded afterthe mall packing film roll is used up, making a waste to polluting theenvironment, with the cost for the winding shafts lost.

SUMMARY OF THE INVENTION

The purpose of the invention is to offer an automatic fast rewinder forshaftless packing film, which can rewind a large roll of packing filminto four small rolls with one rotation of a rotary wheel, shorteningtime needed for rewinding, boosting production and efficientlyprotecting the environment with no waste of winding shafts by usingreusable inflatable shaft for rewinding work.

The features of the invention are a body, a feeding box, a pair ofrotary discs positioned to be separated from each other with a certaingap and four pairs of pinching heads connected with a moving device andpassing through the pair of rotary discs in a equidistantly spaced apartcondition, plural guide wheels, a pressing wheel, a saw-teeth cuttingunit, and a collect unit. Then plural inflatable shafts inflated areplaced in the feeding box and then are orderly moved down through theguide passage of the feeding box to a first position that the firstinflated shaft is to be pinched one by one on by a first pair ofpinching heads of the rotary discs, which are then rotated one time for90 degrees to let the first inflated shaft on the first pair of pinchingheads moved to a second position where the first inflated shaft islocated nearby the last guide wheel so that packing film of the largeroll is wound on the first inflated shaft on the first pair of pinchingheads to a needed length. Then the pair of rotary discs is rotated againfor 90 degrees to let the first pairs of pinching heads move to a thirdposition where the first inflated shaft with the wound packing film ismoved to a third position where the first inflated shaft is located nearthe saw-teeth cutting unit, so the first inflated shaft wound with thewound packing film is cut off the large roll, and then released by thefirst pair of pinching heads that are pulled outward by the movingdevice and then dropped with its own weight to the collect unit wherethe first inflated shaft wound with the packing film is picked up andthen the inflated shaft is deflated to shrink and pulled off to make afinished small packing film roll with no shaft. Meanwhile, a second pairof pinching heads is moved to the first position by one quarter rotationof the pair of rotary disc to pinch a second inflated shaft by themoving device, and in the way that the first inflated shaft is woundwith the packing film, moved, cut off and dropped on the collect unit,the second inflated shaft is wound with packing film and moved, cut anddropped on the collect unit in order. Therefore one round of wholerotation of the pair of rotary discs can produce four small packing filmrolls with no winding shaft.

BRIEF DESCRIPTION OF DRAWINGS

This invention will be better understood by referring to the drawings,wherein:

FIG. 1 is a side view of a conventional rewinder for packing film;

FIG. 2 is a side view of the conventional rewinder for packing film,showing packing film being cut;

FIG. 3 is a perspective view of a small packing film roll of theconventional rewinder for packing film;

FIG. 4 is a perspective view of an inflatable shaft in the presentinvention;

FIG. 5 is a side view of an automatic fast rewinder for shaftlesspacking film in the present invention;

FIG. 6 is a side view of the automatic fast rewinder for shaftlesspacking film in the present invention, showing a packing film being cut;and

FIG. 7 is a perspective view of an inflatable shaft in the presentinvention, showing it deflated and taken out of a small packing filmroll rewound from a large packing film roll.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

A preferred embodiment of an automatic fast rewinder for shaftlesspacking film in the present invention, as shown in FIGS. 4, 5 and 6,includes a body 2, a support frame 20, plural guide wheels 21, apressing wheel 22, a feeding box 3, a pair of rotary discs 4, asaw-teeth cutting unit 5, a collect unit 7 and plural inflatable shafts7.

The support frame 20 is positioned on the body 1 for holding a largeroll of packing film (a).

The plural guide wheels 21 and the pressing wheel 22 are arrangedorderly on the body 2 and rotated to move the packing film (a) from thelarge roll held on the support frame 20.

The feeding box 3 is placed on the body 2 for containing a number of theinflatable shafts 7 in the inflated condition, provided with a guidepassage 30 extending down from one side of the bottom for the inflatedshafts 7 to orderly falling down, and a stopper 31 fixed at a lower endof the guide passage 30 for stopping a lowest inflated shaft 7.

The pair of rotary discs 4 is installed to face each other and separatedby a distance longer than the length of the inflatable shaft 7 under theguide passage 30 and four pairs of pinching heads 40 movably fittedthrough the pair of rotary discs 4 equidistantly spaced apart around therotary discs 4 for being moved inward and outward to pinch and releasethe inflated shaft 7 remained at the stopper by means of a moving unitand rotating together with the rotary discs 4 at the same time.

The saw-teeth cutting unit 5 is located at one side of the rotary discs4 for cutting off packing film (a) of a large roll after rewound on theinflated shaft 7 and the inflated shaft 7 with the wound packing filmbecomes a small roll of packing film (a) with the inflated shaft 7.

The collect unit 6 is located to extend from under the rotary discs 4 tothe outside of the body 2 for collecting the small packing film rollsafter released from the pair of pinching heads 40.

The inflatable shaft 7 is provided with a rubber cover 70 round itsouter surface and to be inflated for use and deflated after the smallroll of packing film (a) is finished.

In using, as shown in FIGS. 4-7, a number of the inflatable shafts 7 arein advance inflated to expand outward the rubber cover 70, and thenplaced in the feeding box 3. The inflated shafts 7 therein thennaturally fall orderly in the guide passage 30 to let the lowest onereach the stopper 31 and stopped there. Then the lowest inflated shaft 7(or the first one) is aligned to a first pair of the pinching heads 40,which are then moved inward to pinch two ends of that first inflatedshaft 7 at a first position just under the stopper tightly between thepair of the rotary discs 4, and the rotary discs 4 are subsequently tobe rotated always clockwise for 90 degrees, or one quarter of a circle,to carry the first pair of the pinching heads 40 together with the firstinflated shaft 7 to contact with one side of the last guide wheel 21,with a second pair of the pinching heads 40 rotated at the same time tothe first position just under the lower end of the guide passage 30 andmoved inward to pinch another inflated shaft 7, so on a third and afourth inflated shaft 7 pinched by a third and a fourth pair of pinchingheads 40. Next, the inflated shaft 7 at a second position, or at theside of the last guide wheel 21 is to be wound with the packing film (a)of the large roll moved by the guide wheels 21 until the diameter of thewound inflated shaft 7 with the packing film (a) reaches the needed one.Then the rotary discs 4 are rotated again for 90 degrees to move thesmall picking film roll just finished rewinding to a third position thatis opposite to the first position, with the packing film (a) of thelarge roll pulled and with the saw-teeth cutting unit 5 swinging upwardto cut the packing film (a) off the large roll. Then the finished smallpacking film roll of the first inflated shaft 7 is released from thepair of the pinching heads 40 that is moved outward by the moving unit,and drops down on the collect unit 6. In the meantime, the secondinflated shaft 7 at the first position is rotated for a quarter circleby the rotary discs and then wound with the packing film (a) of thelarge roll at the second position, and so on. In this way the four pairs(the first, the second, the third and the fourth) of pinching heads 40can carry four inflated shafts 7 to be rewound with packing film (a) andrelease them to let them drop on the collect unit one by one, and thenthe inflated shaft 7 is deflated to enable it pulled off, finishingmaking four small packing film rolls with no winding shaft by one roundof full rotation of the rotary discs 4, speeding up operation ofrewinding the large roll into plural small rolls of the packing film (a)without a shaft. In this way, finished small packing film rolls need nowinding shafts (b), saving a lot cost of and being very effective forprotecting the environment by reusing the inflatable shafts.

While the preferred embodiment of the present invention has beendescribed above, it will be recognized and understood that variousmodifications may be made therein and the claims are intended to coverall such modifications that may fall within the spirit and scope of theinvention.

1. (canceled)
 2. An automatic fast rewinder for shaftless packing filmcomprising: a body (2), a support frame (20), plural guide wheels (21),a pressing wheel (22), a feeding box (3), a pair of rotary discs (4), asaw-teeth cutting unit (5), a collect unit (7) and plural inflatableshafts 7; wherein the support frame (20) is positioned on the body (1)for holding a large roll of packing film; the plural guide wheels (21)and the pressing wheel (22) are arranged orderly on the body (2) androtated to move the packing film from the large roll held on the supportframe 20; the feeding box (3) is placed on the body (2) for containing anumber of the inflatable shafts (7) in inflated condition, provided witha guide passage (30) extending down from one side of a bottom thereoffor the inflated shafts (7) to orderly fall down, and a stopper (31)fixed at a lower end of the guide passage (30) for stopping a lowestinflated shaft (7); the pair of rotary discs (4) is installed to faceeach other and separated by a distance longer than a length of theinflatable shaft 7 under the guide passage 30 and four pairs of pinchingheads 40 movably fitted through the pair of rotary discs 4 equidistantlyspaced apart around the rotary discs 4 for being moved inward andoutward to pinch and release the inflated shaft 7 remained at thestopper by means of a moving unit and rotating together with the rotarydiscs 4 at the same time; the saw-teeth cutting unit 5 is located at oneside of the rotary discs 4 for cutting off packing film of a large rollafter rewound on the inflated shaft 7 and the inflated shaft 7 with thewound packing film becomes a small roll of packing film with theinflated shaft 7; the collect unit 6 is located to extend from under therotary discs 4 to an outside of the body 2 for collecting the smallpacking film rolls after released from the pair of pinching heads 40;each inflatable shaft 7 is provided with a rubber cover 70 round itsouter surface and to be inflated for use and deflated after the smallroll of packing film is finished; wherein in using, a number of theinflatable shafts 7 are in advance inflated, and then placed in thefeeding box 3; the inflated shafts 7 therein then naturally fall orderlyin the guide passage 30 to let the lowest one reach the stopper 31 andstopped there; then the lowest inflated shaft 7 is aligned to a firstpair of the pinching heads 40, which are then moved inward to pinch twoends of that first inflated shaft 7 at a first position just under thestopper tightly between the pair of the rotary discs 4, and the rotarydiscs 4 are subsequently to be rotated through 90 degrees, to carry thefirst pair of the pinching heads 40 together with the first inflatedshaft 7 to contact with one side of the last guide wheel 21, with asecond pair of the pinching heads 40 rotated at the same time to thefirst position just under the lower end of the guide passage 30 andmoved inward to pinch another inflated shaft 7, next, the inflated shaft7 at a second position, or at the side of the last guide wheel 21 is tobe wound with the packing film of the large roll moved by the guidewheels 21; then the rotary discs 4 are rotated again through 90 degreesto move the small picking film roll just finished rewinding to a thirdposition that is opposite to the first position, with the packing filmof the large roll pulled and with the saw-teeth cutting unit swingingupward to cut the packing film off the large roll, then the finishedsmall packing film roll of the first inflated shaft 7 is released fromthe pair of the pinching heads 40 that is moved outward by the movingunit, and drops down on the collect unit 6; and then the inflated shaft7 is deflated to enable it pulled off, finishing making four smallpacking film rolls with no winding shaft by one round of full rotationof the rotary discs 4, speeding up operation of rewinding the large rollinto plural small rolls of the packing film (a) without a shaft; in thisway, finished small packing film rolls need no winding shafts; saving alot cost of and being very effective for protecting the environment byreusing the inflatable shafts.